SNA350
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A340 Cockpit Question

Thu Jan 19, 2006 10:21 am


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what's the panel just above the MCDU's used for?
i've seen A330/340 with and without

many thanks in advance
Aircraft flown: B733, B734, B736, B737, B738, B744, B752, B763, B772, A319, A320, A321, A343, A346, Do328, CRJ7, E190
 
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zeke
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RE: A340 Cockpit Question

Thu Jan 19, 2006 2:43 pm

Its called a DCDU - Data Communication Display Unit, you can find them on anything from the 320 series to 380. Its for CPDLC (Controller Pilot Data Link Communications), the pilots "Log On" to the ATC centre and instructions to and from the aircraft are passed to the aircraft via CPDLC instead of voice communications on VHF or HF radio.

The flightcrew is alerted to an incoming message by means of a flashing blue «ATC MSG» light in two pushbuttons on the glareshield, as well as by a dedicated audio sound which is similar to a telephone sound. The alert is stopped by pressing one of these two pushbuttons or by answering the message, directly on the DCDU. For normal messages the buttons flash, and the audio signal is repeated about every 15 seconds (with the first signal delayed by 15 seconds, so as not to multiply audio warnings). The message will appear on the DCDU if the screen is empty. If the screen is not empty, a flashing cue (e.g. «MSG 1/2») reminds the crew of the arrival of the message. For urgent messages the buttons flash, the audio signal is repeated about every 5 seconds, and the message is displayed on the DCDU regardless of the state of the screen.

To reply to a message, the flightcrew either uses the standard replies on the DCDU (WILCO, UNABLE, STANBY, ROGER, AFFIRM, NEGATIVE etc) or composes a reply on a menu-page from the MCDU. After composing the message on the MCDU it is transferred to the DCDU for sending.
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SNA350
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RE: A340 Cockpit Question

Fri Jan 20, 2006 1:49 am

interesting
thanks for the info
Aircraft flown: B733, B734, B736, B737, B738, B744, B752, B763, B772, A319, A320, A321, A343, A346, Do328, CRJ7, E190
 
FrancoBlanco
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RE: A340 Cockpit Question

Fri Jan 20, 2006 1:58 am

Could it be that Boeings have the same system integrated in the FMC/CDU? While watching the Just Planes DVD about the United 777 I noticed (or it is even mentioned by the captain) that the flightcrew were reading off messages from the CDU from time to time; obviously there were not only ACARS messages but also ATC communication going on (e.g. departure clearance, oceanic clearance).

Or am I completely wrong?

Sebastian
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RE: A340 Cockpit Question

Sat Jan 21, 2006 8:13 pm

They are also present in the 737NG operated by SAS.
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ClearedDirect
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RE: A340 Cockpit Question

Tue Jan 24, 2006 5:02 am

Nice - so now they are text messaging.
So I imagine it would be nice if you get a complex re-route, they could send it to you via text??

Is it my blurred vision or does the EICAS on that pic still show them in CLB (climb) mode?

CD
 
SNA350
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RE: A340 Cockpit Question

Tue Jan 24, 2006 5:49 am

Quoting ClearedDirect (Reply 5):
Is it my blurred vision or does the EICAS on that pic still show them in CLB (climb) mode?

don't think so it will be CRZ (cruise)
because the alt mode is active on the autopilot (and not the vert speed mode as it would be in a climb) and also the vert speed is zero (you can see that on the PFD on the far right
Aircraft flown: B733, B734, B736, B737, B738, B744, B752, B763, B772, A319, A320, A321, A343, A346, Do328, CRJ7, E190
 
ClearedDirect
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RE: A340 Cockpit Question

Tue Jan 24, 2006 5:53 am

Quoting SNA350 (Reply 6):
vert speed is zero (you can see that on the PFD on the far right

Correct - i noticed. That is why I had the question. I blew up the picture as much as I could and it just looked like CLB versus CRZ.

No big deal....
 
milan320
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RE: A340 Cockpit Question

Tue Jan 24, 2006 5:59 am

Quoting ClearedDirect (Reply 5):
Is it my blurred vision or does the EICAS on that pic still show them in CLB (climb) mode?

I believe the A340 series EICAS always displays the CLB letters regardless (someone correct me if I'm wrong).
But if you look at the PFD you'll see ALT CRZ - so definitely not climbing.
-Milan320
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ClearedDirect
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RE: A340 Cockpit Question

Tue Jan 24, 2006 7:53 am

Quoting Milan320 (Reply 8):
But if you look at the PFD you'll see ALT CRZ - so definitely not climbing.

Ahh - now there ya go - did not notice that.
Interesting about the EICAS though...
 
buckfifty
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RE: A340 Cockpit Question

Tue Jan 24, 2006 9:27 am

It's actually called an ECAM on the Airbus. And it shows CLB because the thrust levers are in the CLB detent (which is standard for cruise). The percentage figure beside it shows the available thrust while the levers are in this detent.

The mode changes depending on the phase of flight, and the mode and detent that the thrust levers are in.
 
FrancoBlanco
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RE: A340 Cockpit Question

Wed Jan 25, 2006 3:12 am

I don´t think they show a percentage in this case, since this is an A340-600 which only comes with Rolls-Royce engines. Their main engine parameter is EPR (Engine Pressure Ratio).

Also on General Electric or CFM engines it wouldn´t be a percentage of thrust. The main parameter on these engines is % N1 (rotation speed of low pressure shaft).

Well, so much for the nit-picking.

Coming back to the topic, does anybody have an answer regarding my question about ATC messages on Boeings (see reply 3)?

Sebastian
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